Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb854d0b78cb2aea…

MALICIOUS

PDF

85.0 KB Created: 2021-09-24 10:31:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 002b7068435086abf4c1e855d7756966 SHA-1: 862c0b34a4df9ae60ce83b2a25617ce1d7413063 SHA-256: bb854d0b78cb2aea99a6b145e8b8e7efefaa209bcc114ad020aa588d7c62ce5c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, employing a 'download button' heuristic and embedding numerous external URLs. Several of these URLs point to compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or redirect users to phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://laborke.ru/uplcv?utm_term=free+black+knight+account+ps4
    • https://truckforceone.com/upload/editor/file/5500016693.pdf
    • https://pmfegypt.com/userfiles/files/katukevonipuje.pdf
    • http://krcatikyonetimi.com/userfiles/file/6734418423.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/d04553df219b579315b9b8de5cc697e1/lulonuwamagigosetopug.pdf
    • https://impulsa.mantareys.net/uploads/plantillas/files/zuvodetuvinep.pdf
    • http://silverspringabw.com/uploads/files/2093812278.pdf
    • http://karmand24.ir/basefile/ehotel724ir/files/60413536492.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/edbc88c4752aa1d00a2ad818880d5109/83365109460.pdf
    • http://inbond-cn.com/userfiles/file/kajumisamowuxaremikem.pdf
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/12259496690.pdf
    • http://sicilyontable.it/userfiles/files/judobawadojuzar.pdf
    • http://podwierzba.eu/ckfinder/userfiles/files/lereno.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/6204b7155c90bd32725a6444caa5e945/fenofoj.pdf
    • http://bulmarconsult.com/files/vipevojotokujo.pdf
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38653109243.pdf
    • http://bephoangdung.vn/uploads/ckfinder/files/forejezaz.pdf
    • http://leebyunghun.kr/new/upload/board/files/30857492021.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/l2dd7c2spmaqqgpr6l7rmt2iu6/namodoxibazigi.pdf
    • http://maroba-zirndorf.de/file/47849572255.pdf
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/regunibuwefuvikinofagetu.pdf
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/16280969179.pdf
    • http://autosoftware.company/autoresponders_images/files/5609419348.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1ad.bin
a7ded34ccca9acf46c5ba685f15e5768b5935d04d2c6e89eeaa0f78220d6b6a0
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AD 11040 bytes
font_01_sfnt_off0000fb1a.bin
7067831645cc8026f03895c346dd8fd44c288e95cf8ec29991a7dd15a5b759b5
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1A 19196 bytes
font_02_sfnt_off00012e31.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E31 16792 bytes